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Top Level Domains (TLDs) are split into two types: Country Code TLDs (cc TLDs) use a standard two letter sequence defined by ISO 3166.
With 100 of millions of hosts and billions of web pages it is an impossible task - it's also pretty daunting even with just a handful of hosts and resources.
To solve this problem the concept of Name Servers was created in the mid 70's to enable certain attributes (properties) of a named resource to be maintained in a known location - the Name Server.
Finally, since 2011 the TLD policy is essentially unrestricted, if you pay enough money and adopt the operating procedures laid down anyone can register a sponsored TLD.
Look forward to a whole set of new TLDs like .singles, .kitchen and .construction arriving. Figure 1-1 Domain Structure and Delegation What is commonly called a Domain Name is actually a combination of a domain-name and a TLD and is written from LEFT to RIGHT with the lowest level in the hierarchy on the left and the highest level on the right.
Remember that the Internet (or any network for that matter) works by allocating every point (host, server, router, interface etc.) a physical IP address (which may be locally unique or globally unique).
Without DNS every host (PC) which wanted to access a resource on the network (Internet), say a simple web page, for example, would need to know its physical IP address.
Resources can be added, moved, changed or deleted at a single location - the Name Server.
At a stroke network management was simplified and made more dynamic.
As our network grows we start to build up a serious number of Names in our Name Server (database). Which leads us nicely into the characteristics of the Internet's Domain Name System (DNS).
The Internet's Domain Name Service (DNS) is just a specific implementation of the Name Server concept optimized for the prevailing conditions on the Internet.
To fix this problem the concept of Primary and Secondary Name Servers (many systems allow tertiary or more Name Servers) was born.Tags: Adult Dating, affair dating, sex dating